Transport Transports 

Canada Canada

 TP 7245E

 

AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your name. ADs are issued pursuant to Canadian 

Aviation Regulation (CAR) 521 Division X. Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H, the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the aircraft. 

Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard. 

This AD has been issued by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Canada, Ottawa, telephone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address. 

To request a change of address, contact the Civil Aviation Communications Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8, or 1-800-305-2059, or www.tc.gc.ca/civilaviation/communications/centre/ address.asp 

24-0022 (01-2005)

1/2 No.

CF-2011-33

Issue Date 

16 August 2011 

Number: CF- 2011-33 

Subject: Engine Support Beam – Cracking on the Upper and Lower Web

Effective: 31 August 2011 

Applicability: Bombardier Inc. Aeroplanes: 

Model CL-600-1A11 (600), Serial Numbers 1004 through 1085 

Model CL-600-2A12 (601 Variant), Serial Numbers 3001 through 3066 

Model CL-600-2B16 (601-3A/3R Variant), Serial Numbers 5001 through 5194 

Model CL-600-2B16 (604 Variant), Serial Numbers 5301 through 5665 and 5701 and 

subsequent.

Compliance: As indicated below, unless already accomplished. 

Background: Cracks on the upper and lower web of the Engine Support Beam (ESB) have been 

discovered on two (2) Challenger aeroplanes in service. Failure of the ESB could 

adversely affect the structural integrity of the aeroplane. 

A Temporary Revision (TR) has been made to the Time Limits/Maintenance Checks 

(TLMC) manual to introduce a new Airworthiness Limitations (AWL) task to ensure that 

fatigue cracking of the ESB is detected and corrected. 

This directive mandates the incorporation of the new AWL task. 

Corrective 

Actions: 

1. Within 60 days after the effective date of this directive, amend the Transport Canada 

Approved Maintenance Schedule by incorporating the new TLMC inspection task, as 

introduced per the following applicable TRs, all dated 31 May 2011: 

Model TLMC Manual Chapter 5 Task 

Number 

TR Number 

600 PSP 605 53-10-00-198 TR 5-151 

601 PSP 601-5 53-10-00-198 TR 5-250 

601-3A/3R PSP 601-5A 53-10-00-198 TR 5-261 

604 CL-604 or CL-605 53-30-00-155 TR 5-2-47 or TR 5-2-9 
No.

N° CF-2011-33 2/2 

2. Initial compliance with the above-mentioned TLMC tasks shall be carried out in 

accordance with the phase-in schedule as detailed in the applicable TRs. 

Compliance in accordance with superseding Temporary Revisions or later revisions 

of the Time Limits/Maintenance Checks manual, approved by Transport Canada,

also satisfies the requirements of this directive. 

Authorization: For the Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Mr. Robert Farinas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, 

facsimile 613-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport 

Canada Centre.